Fix issue https://gitlab.com/wg1/jpeg-xl/-/issues/149
Fix issue https://gitlab.com/wg1/jpeg-xl/-/issues/149

There was a typo: XYX instead of XYZ string for ICC

This means the 0.3.1 encoder is creating invalid files

libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl,libjxl/libjxl